Wood screw



\Aug.11,1942. w WILSON '2,292,557

WOOD SCREW Filed sept. 25, 1941 v INVENTOR.

l 1 Patented A118. 1v1, 1942 I' l 2 UNITED STAT-Es y PATENT OFFICE 2.292.551@

woonscnaw. Wesley Wilson, Chicago, v Application september z5. isla-serial No. 412,236

islamieten-41) u p My invention relates to wood screws. y .as-shown in Fig. 3, the hole in the outer ooring One of the objects of my invention is to proabove the threaded portion l of the screw may vide a wood screw which can be used to take be illledwithawood ller 3 to cover the screw.

the squeak out oi a door or sheathing construc- In use, a hole may be rlrst drilled through tion, or the like. I the outerlilooring and cushioning layer and into A further object is to provide a wood screw the inner ilooring. The drill may be vso shaped which can be use'd to secure andl clamp an outer that the outer portion of the hole drilled will be door or sheathing snugly in place. j 4 g of somewhat larger diameter than the inner por- A further object is to provide such a. contion. The diameter of the inner part ofthe hole vstruction in which the securing and clamping u) may be about the same diameter-as the yroot screw may be concealed. diameter of the threaded point oi the -screw 5,

Further objects and advantages o1 the inven and the o'uter part o1' the hole may'v have a dition will be apparent from the description and ameterabout equal to the root diameter ofthe claim. n f threaded portion t of the screw. The screw is In the drawing, in which several embodiments then inserted and screwed downby Vmeans of a of my invention are shown,V screw driver engaging the head l. The nrst part Figure 1 is a sectional view through a-iloor oi the rotational movement of thev screw will' construction, the screw being shown in eleva- `cause the point of the screw lto thread. down tion; Y into the irmer flooring until the large diameter Fig. 2 is a. sectional view through a flooring o threaded portion I begins to engage-,the outer showing another form of screw; lportion of the hole. When this outer portionA Fig. 3 is a sectional view showing the upper part begins to bite into the outer hardwood ilooring, of the screw shown in Figure 1 broken oi! and f further rotation of the screw willtend to draw covered; and f the inner and outer rloorings together, due to the Fig. 4 is a sectional view showing a flooring difference inpitch of the two threaded portions and support with the securing screw shown in 5 and` 8 of the screw. When the floorings are elevation. v y Y clamped tightly together, iurtherrotation of the Referring to the drawing in detail, and ilrst screwdriver will break oil.' the head o1 the screw to Figs. 1 and 3, the construction shown comat the weakened portion Il, as shown in Fig. 3.

prises an inner flooring or base I which may The holeabovethe screw maythenberllled with be of relatively soft wood, an outer ilooring'or a wood filler l. y 'A sheathing 2 which may be of relatively hard The construction showninFig.2is substantialwood, a layer 3 of compressible cushioning maly the same as that shown in Figs. 1 and 3,'except terial between the two layers of flooring, and a that here the upper end of the vscrew-ls provided securing and clamping screw l. "Thesecuring with a wrench-engaging socket for engagement and clamping screw comprises a relatively small with the noncircular end of a wrench Il. In this diameter, relatively coarse pitch, tapering. form the head of the screw will completely enter threaded point 5l for entry into threaded enthe hole in thev hardwood flooring and may bel gagement with the inner flooring I, and a relscrewed somewhat below the upper surface as Aatively large diameter, relatively vline pitch, 40 shown. v

threaded portion t for entry into threaded enlThe construction shown in Fig'. 4 is substantialgagement with the outer ilooringl." The screw ly like that shown in'Figs. 1 and 3 except that has a shank portion 1 of substantial length be-l here the point 5 o1 the screw enters a yiloor suptween the threaded portions toenable-the pointed, portingy member I2, such as a `joist, andthe tapering, threaded portion 5 to enter into sub- 45 threaded portion t ofthescrew'does not enter into stantal engagement with the inner flooring Iv threaded engagement'with the inner flooring I. before the ilne pitch, threaded portion l enters 'I'he outer large diameter threaded portion eninto threaded engagement with the outer iloorgages the hardwood outer ilooring or sheathing ing 2. The screw has a head l extending above 2v just as shown in Figs. 1 and 3. In this form, the floor line and -having a weakened connection 5o both the inner flooring I'and the cushioning layer with the threaded portion i oi' the screw below 'l are .clamped between the joist I2 and the outer the floor line to enable the head and upper hardwood dooring 2.. The head of the screw may portion of the shankv to be broken oi! when the be broken oil' andthe Space above the Screw filled outer ilooring 2 is securely clamped in place just as shown in Fig. 3. as shown in Fig. 3. After-the screw `is in place, Screws such as shown might be used in ltightening up and taking the squeak out of the hardwood flooring or for securing and tightening up sheathing in boats or, in general, in any place where it is desired to secure an outer wooden iinishing layer onto an inner wooden base.

Further modiiications will be apparent to those skilled in the art and it is desired, therefore, that the invention be limited only by the scope of the appended claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

A clamping wood screw having a shank comprising a tapered end portion having a thread oi relatively high pitch for threaded engagement with an inner layer, a rearward portion having a thread of relatively low pitch for threaded engagement with an outer layer, and an intervmediate unthreaded portion of substantial length snugly together.

WESLEY WILSON. 

